DULUTH, Minn. (AP) -

Part of a national park in northwestern Wisconsin having problems with increased bear activity could be closed for as long as two weeks.

Apostle Islands National Lakeshore officials had to close Sand Island on Wednesday after a bear entered campsites and even a beached boat. No one has been hurt.

Superintendent Bob Krumenaker says they are hoping the closure conditions the bear to look for natural food sources instead of human food.

Krumenaker says they've had to close other islands because of bear activity in the past and a couple times reopened too soon and the bears returned. He says it could be a week or two before Sand Island reopens.